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Prelimina Environmental Assessment Work Plan Pittman Elementary School April 21,2003 Revised July 2,2003 Page 6 Soil Samples—PCBs Samples collected from the electrical switching station areas will be collected with a slide hammer. The samples will be collected within laboratory-supplied brass sleeves sealed by Teflong sheets and plastic end caps. The deeper subsurface samples will be collected at each sample location by using a stainless steel hand auger and slide hammer. Each sample will be labeled for sample identification and placed in a cooler chilled with ice. Prior to use at each soil sample location, all sampling equipment will be decontaminated in the field with a solution of laboratory-grade, non-phosphate detergent and deionized water and then rinsed. Following the sampling of each sampling scheme and the decontamination of the equipment, an equipment blank sample will be collected. Sail Vapor Samples The soil vapor samples will be collected using soil vapor sampling equipment and the direct push equipment. The samples will be collected in Tedlar bags for the methane and hydrogen sulfide analyses and in Summa canisters for VOC analysis. Groundwater Samples The groundwater samples will be collected in 40-milliliter VOA vials for VOC analysis. :i 3.2.3 Sample Analyses Upon completion of the fieldwork, the samples will be delivered under chain-of-custody procedures to California-certified laboratories for analyses. Severn Trent Laboratories, Inc. of Denver, Colorado, will perform the analyses for the soil samples and associated equipment blank samples. Soil vapor samples will be analyzed by Air Toxics Ltd. of Folsom, California. The groundwater samples will be analyzed by Argon Laboratories of Ceres, California. a The laboratory method detection limits for organochlorine pesticides, and CAM 17 Metals are below the established PRG values and one-half of the PRG values for all analytes. The laboratory analytical methods, detection limits, and associated USEPA Region IX PRG values are presented in Appendix D. 3.2.4 Quality Assurance Measures All samples will be submitted to the certified laboratories employing quality control procedures specified in SW-846. The laboratory data will include information regarding: 1. field sample numbers cross-referenced to laboratory sample numbers, 2, detection limits, 3. quality control sample results (such as matrix spikes performed on these samples and complete data packages to include surrogate recoveries confirming calibration checks), and a 4. case narrative, signed by laboratory personnel, stating whether the quality control procedures were met and listing any discrepancies. The data will be qualified in accordance with the National Functional Guidelines (EPA-540R-94-012 and -013). Each laboratory has a Quality Assurance Procedures (QAP) manual or equivalent document that are available upon request. A copy of blank sample container labels and a blank chain-of-custody form are included in Appendix E. 1 , �, CONDOR